Tissue slurry -- Ontario, Canada
This man-made lake in Terrace Bay, Ontario, Canada, is more than 500 metres long. It's an aeration pond, part of the waste-treatment system at a factory that produces pulp for Kimberly-Clark tissues. "The treated water is returned to its source -- often a river," says Fair. Each yellow cone is an "agitator" that aerates and churns the liquid, assisting its breakdown. According to Worldwatch Institute figures, if recycled paper was used instead, 64 per cent less energy would be needed.